Electrochemistry and ion concentration, Chemistry

Assignment Help:

ELECTROCHEMISTRY AND ION CONCENTRATION

Activity dependence of cell voltage:

Measurement of galvanic cell potentials away from the standard state provides a convenient method for measuring ion activity and activity coefficient. As ion concentration is varied in a half-cell to vary ion activity. Equilibrium position of the half cell reduction reaction changes and that causes a change in the half-cell potential. The relationship between the activity and half-cell potential is given by the Nernst equation:

890_electrochemistry.png

for the general half-cell reduction reaction:

 aA+bB+ne-→cC+dD

Cells at equilibrium:

When a cell is at equilibrium, Ecell=0 (the 'flat battery' condition) and Q=K, the equilibrium constant for the reaction (see Topic C1). This gives the expression: which allows calculation of equilibrium constants (see Topic C1) for cell reactions from calculated or measured values.

 

199_electrochemistry1.png

which allows calculation of equilibrium constants for cell reactions from calculated or measured 1046_electrochemistry2.png values.


Related Discussions:- Electrochemistry and ion concentration

Potential energy, As electron moves away from the nucleus, its potential en...

As electron moves away from the nucleus, its potential energy: (1) Increases (2) Decreases (3) Remains constant (4) None of these Ans:  Increases

Dna nucleotides - biomolecules, DNA nucleotides Adenine ...

DNA nucleotides Adenine + Deoxy ribose sugar + Phosphate → Adenosine phosphate Guanine

Law of chemical equivalent, 10 g of h2 and 64 g of o2 are filled in a steel...

10 g of h2 and 64 g of o2 are filled in a steel vessel and exploded amount of water produced in this reaction

Explain pseudo first order reaction, Give an example of a pseudo first orde...

Give an example of a pseudo first order reaction. Write the IUPAC name of the following: (CH 3 ) 2 C=CHCOCH 3

What is the extent of h-bonding in hf, Since flourine is very electronegati...

Since flourine is very electronegative as a result hydrogen makes a very positive character.as a result the H-bonding is very strong because of large difference in electronegativit

What is the meaning of casting - fabrication processes, What is the meaning...

What is the meaning of Casting - fabrication processes Fe-C alloys with more than 2% carbon are known as cast irons. On crossing liquidus, proeutectic crystallizes first. O

Mass, How many grams of NaCl will be produced when 2235 g of HCl are neutra...

How many grams of NaCl will be produced when 2235 g of HCl are neutralized by an excess of NaOH according to the equation below? HCl + NaOH ---> H2O + NaCl

Define standard reduction potential, Q. Define standard reduction potential...

Q. Define standard reduction potential ? Ans. The standard reduction potential, E o As we have seen in the example of a chemical cell in the previous section, the redox rea

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd